Patch 5.0.4 (28 August 2012): Changed from When active, 20% of all damage taken by the caster is taken by your Imp, Voidwalker, Succubus, Felhunter, Felguard, or enslaved demon instead. That damage cannot be prevented. Lasts as long as the demon is active and controlled.

Patch 4.1.0 (26-Apr-2011): Soul Link will no longer be removed by mounting when in a Rated Battleground.

Patch 3.3.0 (08-Dec-2009): Damage transferred via this ability can now be prevented by damage absorption effects.

/Patch 3.0.2 (14-Oct-2008): Soul Link (Demonology) is now an 11-point talent (used to be a 31-point talent), but the 5% bonus damage from this talent has been removed. In addition, the damage absorbed by Soul Link is now 15%, down from 20%.

Patch 2.1.0 (22-May-2007): Adjusted tooltip to explain that the damage transferred to the pet cannot be prevented. The functionality remains unchanged. This ability will now work with enslaved demons.

Patch 2.0.3 (09-Jan-2007): The damage increase component of "Soul Link" has been improved. The damage mitigation component has been reduced.

Patch 1.11.0 (20-Jun-2006): If your pet is banished, Soul Link will stop functioning until Banish wears off. In addition, Soul Link’s tooltip has been clarified to indicate it only works with your imp, voidwalker, succubus, or felhunter.

Patch 1.8.0 (10-Oct-2005): Percentage of damage split with pet has been reduced. Is now a spell cast on your pet that gives an aura to both you and the pet. This aura increases all damage caused by you and your pet by 3% and splits 30% of all damage taken by the caster to the pet. The aura will last as long as the pet is active, and the pet must be the target of a dispel effect in order to dispel this ability. Formerly redirected 50% of all damage and lasted for 30 seconds, but was dispellable.

Patch 1.7.0 (13-Sep-2005): Fixed a bug where Soul Link and Power Word: Shield, when used together, would heal the Warlock instead of splitting or absorbing damage.